Epicyclic transmission



Feb. 3, 1931. H. A. KNOX ET AL EPICYCLIC TRANSMISSION Filed March 3,1926 2 Sheets-Sheet 1 A. v Bert F E1 aka r 4 Qm 5 1 m affozueq I HarvFeb. 3, 1931. H. A. KNOX ET AL 1,791,167

EPICYCLIC TRANSMISSION Filed March 3 192,6 9. Sheets-Sheet 2 Bert FE1aker Patented Feb. 3, 1931 h V l r UNETED STATESPATENT. OFFICEHARRSCA. AND BER-'1 F BAKER, OF JVJAVENPORT, IOWA r nrI'oYoLIoTRANSMISSION. V

v I 7 Application filed. March 3, 1926. Serial No. 92,077. I (GRANTEDUNDER THE Aer or MARCH 3, 1883, as AMENDED APRIL so, 1928; 370 o. e.757) The invention described herein be designated A, B, and C,respectively, for the manufactured and used by or for-'vth e Governlow;intermediate and high speeds. ment tor governmental purposes Without theThe first or lOW speed group consists of a payment to us oi any royaltythereon. sun wheel 6 splined on the shaft 5 and mesh- 5 This inventionrelates t0 L ep cy mg with planet Wheels 7 mounted on studs 55/gallsmlsslgll 0f d ylij tal d i g 3 's: 8 projecting from a disk 9formed on a mnges 0 p are 0 me i p driven shaft 10 -Which transmitspower g p g a i t g speeds r? a through a pinion 11 and reduction gear12 w fii sz roig 16 P @116 f l movemen 0 to the final drive unit 13.Surrounding the In the application of such transmissions t0 i fi ggithe-rewith 1S track laying vehicles a plurality ofspeeds i 'l y 65 mgare desirable to provide for maneuvering of 611m y apted recelve brake ithe vehicle but it is also requisite to provide a s t :1 y be heldstatlonary as 15 Well 16 suitable range of speeds. I v V v a Theprincipal 0b 'ect of this invention then T nd group consists of a disk16 is toprovide such arange of speeds and in p l t9 h Shi1ft 5 nd formedWith an accomplishing this purpose to so arrange the Y g g 1666internally. meshing transmission unit that by its compactness it hPlanet Wheels 17 mounted on Studs 18 will be appropriate in sizeto thevehicle Carried y dlsk 19 which is splined to a 70 h i usedx v 1 plate20 secured to and forming part of the Th lt i d d b o idi one ring 14 ofthe first group. The planet Wheels element, constituting the ring of thefirst 1-180 111G511 \Vltll ELSUII Wheel \VlllCl'l COD" speed epicyclictrain, the planet set of the stitutes the hub of the Wheel 21a journaledthird speed group; by incorporating a r ceive a brake band 22 similar tothe ring of duction element in the planetary set of the lJhfi first g opthi d speed group d b arranging t l ck .The third group is closelyidentified with the sun Wheel of the second group. the Second group dincludes a Set of planet T th d th d our i e ti ivheels 23 meshing withan internally toothed 0 consists in the construction, arrangement and P111524: adapted to receive a brake band 25. combination of elements,described herein- T planet Wheels 23 are carried by the moafter andpointed out inthe claims forming i W I 118k 16 through the instrumentalat f th1g jfi ti I v ity of a spool'28a on which is integral a re- Apractical embodiment of ourinvention q m g a .2 eshing wi h n Wheel 85illl'lstrated in the accompanying drawing, integral \Vllill- (llSkllllllfi h i I be noted that thedisk 19 is a unit including Fig. l is alongitudinal, sectional View the sun Wheel of thethird group, the planetthrough a transmission unit constructed in Set O the Second g pallfilthe g f h accordance with the invention; I first g P- I V 90 VFig. 2 is an enlarged sectional view of the 099121131011 0f the e lll mi as folthree speed groups; I OWS r i I Fig. 3 is a detail sectionalview on the line Wh the Ilng 14 of the first group A is 3-3'of Fig. 2';and braked the motor driven sun Wheel 6 causes Fig, 41 a fragm nta y ndi of Fig, 3. the planet Wheels 7 to turn on their own axes 95 Referringto the drawings by numerals of and also to make an orbital progressionreference: i v 7 around the sun Wheel, Which movement is Thetransmission unit for each track of the given to the driven shaft 10.The other two vehicle comprises three epicyclic groups arspeed groups, Band C, during this phase ranged side by side on the drive shaft 5 andrun idle.

second speed group and the sun Wheel'of the On the hub f h plate 20and-adapted to 2 j For the second speed group the brake band 22 alone isapplied to hold stationary the sun Wheel 21. The motor driven ring 16adriving the planet Wheels 17 causes them to make an orbital movementaround the sun wheel and carry around the disk 19 and with it the ring1lof the first group. The ring Ll will then revolve in the samedirection as the sun wheel 6 and the resulting differenial in speedbetween these two elements gives a proportional orbital movement to theplanet wheels of the first group and consequently a second speed to thedriven shaft 10.

For the third speed group the brake band applied. The planet pinions223b carried by the motor driven disk 16 are thereby caused to revolveat a definite ratio with respect to engine speed and drive the sun wheel26 integral on the disk 19 which being connected to the ring l t of thefirst group, said ring. will be driven at a certain definite speed. Thedifferential of speed between this ring and the sun wheel6 will controlthe speed of the driven shaft 10 in the same, manner as in the-secondspeed.v The third speed is thus compounded of the third and firstgroups, the second group being omitted.

Power from the motor is transmitted to the drive shaft 5 by means of thebeveled gear wheels 27 27 loosely mounted thereon and each provided witha clutch element 28 for engagement with a sliding flux 29 spiined to theshaft 5. This arrangement is of the conventional type andprovides forforward or reverse drive of the shaft accord ing to which of the beveledgears is engaged.

The transmission unit for each track is also provided with a brakeelement 30 which is splined on the driven shaft 10.

lVe claim:

1. An epicyclic transmission including a driving shaft, three groups ofepicyclic gearing carried thereon and operatively connected thereto fortransmitting power at low, intermediae and high speeds, the ring of thelow speed group being operatively connected to the planet carrier of theintermediate speed group and to the sun wheel of the high speed group, adriven shaft in operable connection with the low speed group, means forlocking the ring of the low speedgroup, means for locking the sun wheelof the intermediate speed group to compound the intermediate and lowspeed groups and means for locking the ring of the high speed group tocompound the high and low speed groups.

2. An epicyclic transmission including a driving shaft, three groups ofepicyclic gearing carried thereon and operatively connected thereto fortransmitting power at low, intermediate and high speeds, an element ofthe low speed group being operatively connected to the intermediatespeed group and to the high speed group, a driven shaft in operableconnection with the low speed group,

group to compound, the high and low speed groups. v i

3. In a transmission, a forward and reverse driving shaft, three groupsof epicyclic gearing arried thereon and operatively connected thereto,the planet carrier of the intermediate group being operatively connectedto the ring of one end group and to the sun wheel of the other endgroup, a driven shaft in operative connection with the end group whosering is connected to the planet carrier of the intermediate groin and acontrol for each group.

4;. In a transmission, a driving shaft, a driven shaft, a low speedepicyclic gearing connected to the driving and to the driven shaft, :1high speed epicyclic gearing connected to the driving shaft and to thering of the low speed epicyclic gearing, the planetary element of saidhigh speed epicyclic including reduction gearing, and a control for eachepicyclic gearing.

An epicyolic transmission including a driving shaft, three groups ofepicyclic gearing carried thereon, a driven shaft in operable connectionwith the first group, a direct driven ring for the second group anda-direct driven planet carrier for the third group, both the ring andplanet carrier carried by the same member.

6. An epicyclic transmission including a driving shaft,three groups ofepicyclic gearing carried thereon, a driven shaft in operable connectionwith the iirst group, a direct driven ring for the second group andadirect driven planet carrier for the third group.

7. An epicyclic transmission including a driving shaft, interrelatedgroups of epicyclic gearing carried thereon, the planet carrier of oneend group directly connected to the d riving shaft, a driven shaft inoperable connection only with the other end group and a control for eachgroup.

S. The combination with a driving shaft and a driven shaft, of a groupof epicyclio gearing operatively connecting said shafts, a plurality ofdirect driven groups of epicyclic gearing difi'erentially coui'iectedthrough the first mentioned group of epicyclic gearing to the drivenshaft and means for selectively compounding thefirst mentioned groupwith either of the plurality of groups.

HARRY A. KNOX. BERT E1 BAKER-.1

